Safety shut-down device for valves on mobile tanks



12, 1965 c. w. BEAZER ETAL 3,155,236

SAFETY SHUT-DOWN DEVICE FOR VALVES 0N MOBILE TANKS Filed Jan. 2, 1962 3 Sheets-Sheet 1 QMWOJU INVENTORS' C.W. BEAZER E.E. REED E.E. KLEINMANN A 7' TORNE KS C. W. BEAZER ETAL SAFETY SHUT-DOWN DEVICE FOR VALVES ON MOBILE TANKS Filed Jan. 2, 1962 3 Sheets-Sheet 2 FIG. 4

IN VENTORS c.w. BE ER E.E. RE

E.E. KLEINMANN VW A TTORNEKS Jan. 12, 1965 C. W. BEAZER ETAL SAFETY SHUT-DOWN DEVICE FOR VALVES ON MOBILE TANKS Filed Jan. 2, 1962 3 Sheets-Sheet 3 7.... 'CLOSED-'(%7J/ 7B O/OPEN INVENTORS' c.w. ZER E.E. ED BY E.E. KLEINMANN A T TORNE rs United States Patent This invention rel-ates to a safety valve shut-off means for tank cars and transport trucks. In one aspect it relates to a combination safety flow valve and shutoff means in operable relation with respect to a storage container. In another aspect it relates to closure of an internal safety valve of a railroad tank car or transport trailer tank due to fire or movement of the tank during loading or unloading. In yet another aspect it relates to means for manually actuating closure of such an internal safety valve.

In the handling of volatile fluids, such as liquefied petro-, leum gas and liquid ammonia, many safety requirements must be met. For example,suchmaterials must be stored in specially constructed tanks which are capable of withstanding the relatively high vapor. pressures, When introducing such a material into a container or removing it, it is necessary that the valve structure employed in such 3,155,235 Patented Jan. 12, 1955 In FIGURE 1 numeral 11 identifies the bottom wall of a tank car tank or a transport truck tank. Reference numeral 12 identifies a valve assembly installed in the bottom wall 1 1 of the tank. This valve structure is fully described in a copending application, Serial No. 61,413, filed October 10, 1960. Broadly speaking, this valve comprises a valve body 1114 provided with bolt holes for insertion of bolts for attaching the valve and a flange 26 with belt holes 15a to collar 13 having bolt holes 27. Thiscollar is welded to the bottom of the tank or it can be made an integral .part thereof. Within the valve body 14 are provided a guide spider 59 for movement of a valve rod on the upper end of which is .a bleed valve 131, illus- I trated in FIGURE 6. Above spider 59 is a valve seat 133 for seating valve head 124 which in turn is mounted on a valve stem 125. This valve stem 125 is a hollow valve systems be provided with a number of safety features.

The present invention provides a number of necessary safety features incornbination with a suitable valve structure as a simple, compact valve assembly. This valve assembly is particularly adapted to be employed in tanks or containers mounted ontransport trucks, or railway cars handling volatile fluids such as liquefield petroleum gas and liquid ammonia. For example, in one embodiment there is incorporatedin this assembly an inertia weight which operates a bell crank through a cam to close the valve incase the tank car or tank truck is inadvertently moved while being loaded or unloaded. The invention also provides a fusible element in such a manner that the vah/e is closed while loading or'unloading in case of a fireT-Furthermore, the invention includes a manually operable means for closing the valve during loading or unloading, the manuallyoperable means being actuatable from a point remote from the valve. An object of this invention is to provide a safety flow valve assembly provided with means for holding the valve open under normal loading and unloading conditions. Another object of this invention is to provide a safety ilow valve assembly which will fail-safe, that is, close the valve automatically upon damage to the apparatus because of fire. Yet another object of this invention is to provide a safety fiow valve apparatus which will close the valve members thereof in case the tank being loaded is inadvertently moved. Yet another object of this invention is to provide such a safety flow valve assembly for use on a storage container which is mounted on a transport vehicle. Other objects and advantages of this invention will be realized. upon reading the following description which, taken with the attached drawing, forms a part of this specification.

In the drawing, "FIGURE 1 illustrates in diagrammatic form, an e'levational view, partly in section, of one embodiment of this invention. FIGURE 2 is a sectional view, taken on the line 2 2, of FIGURE 1. FIGURE 3 is an elevational view of an alternate embodiment of a portion of the apparatus of FIGURE 1, FIGURE 4 is an elevationalview, partly in section, of another embodiment of this invention. FIGURE 5 is an elevational view of an alternate embodiment of a portion of the apparatus of FIGURE 1. FIGURE 6 is a sectional, elevational view of a valve suitable for use with the safety shu-t olf apparatus of this invention, as a second embodiment.

' slightly beyond bracket 33. To this extend end of rodflfi stem and surrounds valve shaft or rod 25. Through the wall of valve body '14 is positioned a shaft 23 on which is fixed a cam 22, The end of cam 22. is rounded at 63 (FIGURE 6) while the opposite end of the cam is provided with a shoulder 61, as illustrated. Opposite cam 22 is an opening 28 in the wall 14 0f the valve body and also an enlarged opening H, as illustrated. Positioned within these openings 19 and Ztlisa rod 16 and a pin Z-l. O-rings '18 and ZS are positioned around rod \16 and pin 28, respectively, forpreventing le-akage from within the valve body. Rod 16 extends through an opening 29 in the screw plug 17. The O-ring l3 is'positioned within this screw'plug 17.

A manually operable handle 3% is attached to the end of shaft 23 on the back side of valve housing 14. The valve handle 30 illustrated in FIGURE 1 by a solid line is in the valve closed position while when illustrated by the dotted line is in the'valve open position.

Rod 16 extends from the valve body 14 and this extended portion is supported by a bracket 31 and a bushing 32. This rodextends further beyond bushing 32 and is attached as by welding or other suitablerneans a push plate 46. To the opposite side of push plate 46 is attached a member 64- having an opening through which a bolt extends. This-bolt 65 can, if desire-cl, be threaded or it need not be threaded but can be retained in place by'a conventional cotter key. Also positioned on this bolt 65 is a yoke assembly 47 to which is attached a cable 48. Positioned around cabled-ti is a movable collar 49 and a fixed or stopcollar 5d. The far end of cable 43 terminates in a handle 51 which is positioned atone end of the tank.

Plurality of support brackets 35 require for proper support of flexible cable 43 are provided. A bracket 34 is'attached as by welding to the bottom of tank wall 11 and to this bracket is attached a tension spring 52. The tension spring 52 is also attached to the movable collar 49 along with an attachment from a fusible link 53, the other end of which is supported by the bracket '33. The stop collar St} is positionedon cable 4-8 by a set screw or other means in such relation to the movable collar 49 that upon fusing of fusible link 53 the tension spring 52 will pull the movable The weight 37 is attached as by welding onto the bottom end of bar 38. The upper end of bar 38 is formed into a curved section 39 and has attached to it a similar curved section 49 as illustrated in FIGURE 2. These two curved sections 38 and 39 are attached together so as to provide an opening between them for accommodation of shaft 16.

The inertia assembly 36 is supported by a pair of brackets 33 through which bolts 42 extend and 'intonuts dill welded to the curved members 39 and 49. This assembly prorod 16 adjacent the side of bracket 31 illustrated. Thiscompression spring is maintained under slight compression by a springkeeper 44 held in place by a cotter pin 45. taining pin 20in its proper relation with'respect to shoulder This spring is provided for the purpose of main-- 61 on cam 22 so that the pin will not be removed from shoulder 61 by vibration of the apparatus during loading or unloading operations.

In the operation of this inertia member for closing the valve while loading or unloading upon movement of the tank with respect to the inertia member for example to the left, the effect is the movement of the inertia member 36 to the right. When this member moves to the right the upper ends of themembers 39 and 46 move to the left and contact the adjacent surface of push plate 46. Push plate 46 is thus moved to the left and it moves rod 16 and pin 21 also to the leftthereby freeing cam 22 for movement to permit closing of the main loading and unloading valve. the right withrespect to the weight 37 the effect is movement of the'weight 37 to the left and'the lower'endsof the members 39 and 40 contact the bottom adjacent edge of push plate 46 with the same result that the pin 21 is moved to release cam 22; e I

Pulling cable 48 manually by means of handle 51 and also failure of the fusible link 53 by permitting tension spring 52 by Way of movable collar- 49 and stop collar 50, move pin 21 from contact with shoulder 61 of cam 22 for valve closing.

t In case the end of tank 11 at which handle 51 is positioned is on fire, it obviously is not .desired to approach handle 51 for. closingthe valve. In this case a clamp 54 is'positioned around. cable 48 adjacent stop collar 50 or at other desired'position on the cable, as in FIGURE 3.

One end of another cable 57 is also attached to clamp 54 andthiscable 57 is passed around a sheave wheel 56 mounted on brackets 55. In this manner the cam 22 can be freed for closing the loading and unloading valve by merely pulling on a handle 58 at the opposite end of the tank from handle 51-. Thus, according to the embodiment illustrated in FIGURE 3, the main loading and unloading valve can be closed manually from either end of the tank.

As mentioned hereinabove, the general valve structure illustrated in FIGURE 1 is actually the valve structure modification in the valve controlling mechanism which is different from that illustrated in FIGURE 1.

In FIGURE 6, illustrating asectional view of the valve,

assembly, the valve body 14 isprovided with a valve seat 133, a valve head 124 supported on a hollow valve stem 125 which in turn surrounds a valve shaft or rod 25.

On the upper end of this valve shaft is positioned bleed.

valve 131 which is adapted to seat against seat 132. A

compression spring 127 is provided as illustrated for biasing this bleed valve downward against its seat. This spring 127 is a relatively strong spring. As mentioned, the valve head 124 is mounted on a hollow valve stem 1 surrounding valve shaft 25. This valve stem and valve head are biased in a valve open position by a compression spring 128. .This spring is a less strong positioned opening for accommodation of thevalve stem' 125. The diameter of this opening is larger than the outer diameter of valve stem 125 to provide an annulus.

In a similar manner if the tank moves to valve body 14 is mounted within tank wall 71.

. 14 I: 136 for passage of fluid. As illustrated in FIGURE 6, In this case when it is desired to unload tank 122 and the proper hose connections have been made it is'merely necessary to move valvehandle 78 to the position indicated by the solid line. At this location cam 22, 77'is raised as illustrated and pushes upward the valve shaft 25 thereby raising bleed valve 131 from its seat 132. ,With bleed valve 131 raised. from its seat, fluid from within the tank follows a path indicated. by the directional arrows through annulus 130, through bleed passageway 129 into the, space below the valve head 124.v In a very short time the pres- V and the tank can be unloaded.

J to withdraw pin 21, 80- from'shoulder61, 62. With this shown in detail in FIGURE 6. However, there is a slight pin so withdrawn the cam 22, 77 releases rod 25 and the strong compression spring 127. biases the ,valve shaft 25 downward thereby, seating the bleed valve 131 against its seat 132., And since compression spring 127 is ma-v terially stronger than compression spring 128, spring 127 overrides the etfect ofspri'ng 128 thereby pushing downward the hollow valve stem 125 and the valve head 124 thereby closingthe valve against further inlet or outlet of fluid to or from the tank. Asmentioned hereinabove, pin 21, is removed from its cam holding position either by manually pulling handle 51,; or handle 58, or on failure of fusible link 53 or by movement of the inertia member 36. Each of these operations; has the result of closing valve 124 against its seat thereby preventing: further discharge or inlet of fluid. I v

. In FIGURE 6 of the drawing is illustrated. another embodiment of this invention involving the' use of an inertia member, manually operable apparatus andalso 'a fusible member for closing the main inlet and outlet valve of a tank. In thiscase a tank wall is identified by reference numeral 71 with the wall having a collar 73 attached thereto for attachment of the valve body 14. This valve body 14 is constructed substantially in the. same manner as thatillustrated above in FIGURE 1 with however, a very slight modification. A shaft 76 is provided with a cam 77 having ashoulder 62 in the same manner as described relative to FIGURE 1. This cam contacts or releases a valve rod 25 for opening or closing a main inlet .or outlet valve head 124. This portion of the valve of FIGURE 6 is the same as illustrated in FIG- URE l. I

The valve of FIGURE 6 differs in thata pin 80 is a separate member from a rod 93 and a piston 87 (FIGURE 4). In the end of piston 87 adjacent pin 80 isa channel 83 for accommodation of an enlarged end of pin 80 and a compression spring184. A closure member 86 is attached to the end of piston 87 adjacent pin 80 for maintaining pin 80 in its proper operable position. vAn O-ring 81 is positioned as illustrated for preventing leakage from within the valve. Valve body 14 -is provided with an enlarged space 82 foraccommodation of piston 87, and cylinder 88. Within cylinder 88 is provided a compression spring 91 positioned around'pis'ton 87 as illustrated. An enlarged end of piston 87 is provided with an O-ring seal 98 as illustrated. Closure 89"is mounted as'illus trated in order; to retain piston 87- within cylinder 88.

A handle 78, as in FIGURE 6, is provided and illustrated with the position illustrated by the solid line havingv the cam 77 in such a position that valve rod 25 is at its uppermost end of its extent oftravel and the valve head 124 is open thereby opening the tank to inlet or outlet of fluid. With the valve handle 78 in theposition illustrated by the broken line, cam 77 is lowered with the result that the cam takes the dotted line position and the valve rod is lowered.

A bleed opening 92, FIGURE 4, is for the purpose of exit of any high vapor pressure fluid from within cylinder 88 in case there is leakage past O-ring 81.

A rod 94, in FIGURE 6, it attached by connection 95 to rod 93 while the opposite end of rod 94 is attached by way of a fusible connection 97 to another rod 96 This other rod is pivoted at 101 to a bell crank 99 which in turn is pivoted at 100 to a support bracket 72. This support bracket is fastened as by welding to the bottom surface of the tank 71.

'An inertia member broadly similar to that illustrated in FIGURE 1 is identified in FIGURE 6 by reference numeral 105. This member comprises a weight 106 attached to a lower end of a bar 104, the opposite end of which is pivoted at 98 to bracket 72. A pin or cam follower 103 extends through bar 104 or the cam follower can be merely welded to one side of the bar. The upper surface of the lower arm of this bell crank is shaped in the form. of a cam'102 as illustrated. With the cam 102 in the'position illustrated in FIGURE 6, cam 102 is held downward to such an extent'that pin 80 being spring loaded by spring 841s maintained in its inoperable. position againstshoulder- 62 when handle 78 is moved to the open position. Upon movement ofweight 106 in either direction the compression spring 91 (FIGURE 4) biases piston 87 to the left thereby moving rod 93, rod 94, rod 96, to the left with the result that the lower arm of hell crank 99 moves upward with cam follower 103 entering one of the cam depressions 136. In this manner pin 80 experiences movement of closure 86 to the leftthereby pulling pin 80 from contact with shoulder 62 thereby freeing cam 77. The strong compression spring 127 as illustrated in FIGURE 6 biases valve rod 25 downward thereby moving cam 77 and handle 78 to'the position indicated closed in FIG- URE 6.

This closing of the valve by downward movement of the valve rod 25 is the result of themovement of weight 106 in either direction, or of melting of the fusible connection 97 which latter allows piston 07 to move to the left under the influence of compression spring 91."

The apparatus illustrated in FIGURE 6 also can be actuated mechanically by pulling a cable 109 or a cable 110 which movement cause members 107 to cont-act a pin 108 thereby moving the inertia member in one direction or the other. This inertia member movement has the same result as if the member were, moved truly by inertia caused by movement of the tank.

Illustrated in FIGURE 5 of the drawing is an apparatus for use in closing the valve of FIGURE 6 when it is desired to provide a push apparatus for valve closure. InFIGURE 5 member 104 is the same strap or bar as member 104 of FIGURE 6 while a push rod 113 is spring loaded by compression spring 114 with the rod being supported by a bushing 112 mounted in the lower end of a bracket 111. The upper end of this bracket, not illustrated in FIGURE 5, is attached as by welding to the bottom surface of tank 71. The push rod 113 extends to one of the ends of the tank in the same manner as cable 48 or cable 57 extends to the tank ends in FIG- URE l and FIGURE 3.

A gasket 115 is positioned at the point illustrated in FIGURE 4 to make a tight connection between the threaded end of the. cylinder apparatus 88 in the outer end of the valve body 14;

To open the valve manually for loading or unloading, it is merely necessary to move the valve handle to the open position illustrated in FIGURES 1 and 6 at which time thecorresponding valve rods will be raised thereby allowing bleeding of pressure from within the tank to the space downstream of the main valve with the result that when the pressures on opposite sides of the main since there is no pressure on the tank side of valve 24,

the outside pressure automatically opens the valve. With the valve so opened then the handle is moved to the open position which then will make certain that. the valve remains open. When the valve handle in either fiigure is moved to the openiposition .the pin 21 or the pin 80 will move to the position against shoulder 61 or shoulder 62 thereby maintaining the valve open during normal loading or unloading operations.

If high vapor pressure fluid has previously been stored in the tank then for opening the valve with fluid pressure on both sides of the main inlet and outlet valve it is then merely necessary to move the valve handle to the open position which operation compresses themain strong compression spring 127 and permits the less strong compression spring 128 to raise the valve 124 off its seat. The valve is then in position to load or unload the tank;

It is preferred that the'valv'e structure of this invention be positioned in the storage container at such a level that the main valve seat is on essentially the same hori- Zontal plane as the bottom of the-container so that essentially complete drainage of liquid can be effected and for safety purposes. -There are also important advantages in transport trucks where it is desired to completely empty the tank and for protection against exterior valve damage.

. .The valve assemblies of this invention will operate at all ambient temperatures. A very definite advantage from a safety standpoint is that the valve is essentially completely internally mounted and is thus protected from possible damage due to mechanical blows or other shocks. A further advantage of this internal mounting is that space is conveniently provided for direct coupling of a pump to the valve flange, thus providing a very compact installation on transport vehicles. Another advantage is that the valve will not contaminate any products passed therethrough because all lubrication is effected by the .material being transported. Another and very important advantage is that the valve is automatically closed in case the tank car or tank truck is inadvertently moved as for example a switching locomotive contacting the end of the tank' car with force. ,Such contact will substantially immediately close the loading or unloading valve. A still further advantage is that by provision of the fusible elements in case of a fire the valve is alsoclosed. Also the valve assembly is provided withmanually operable closure means so that if for any reason other than a fire or a tank movement the valve can be closed. e

While certain embodiments of the invention have been described for illustrative purposes, the invention oba stem extending to an out-of-tank position to open said valve;

(3:) lever means for operating the cam and shaft means of (2.); i

(24)" a locking shoulder onthe cam of (2) for holding samein positionactuating said stern to-openvsaid valve; a

(5)? a pin: supported. in alignment with the cam of (2) so as to be. reciprocable into and out of locking engagement with the shoulder of (4);

,(6) means biasing the: pin of (5) into locking posi 'tion; i (7): mechanical linkage connectingthe pin of (5) with a remote operating means;'and a ('8) a stop fixed on the linkageof (7);

('9) a collar slidable on the linkage of (7) into contact with the stopof (8);

(l) biasing means urging the collar of. (19') toward theistop of (8.); and a (11) a linkageincluding a section fusible just above maximum atmospheric temperature restraining the biasing means of (10), whereby melting of said section allows the biasing: means of (10) to operate and actuate. the linkage of (7) to allow said valve 'to close.

2. Theapparatus of claim 1 including (8) a pendulum actuating means for the pinof operable to pull said pin off said shoulder. by sudden movement of: said tank in a direction longitudinally of said" pin, said pin extending parallel with the horizontal axis of said tank.

3. In a fluid dispensing apparatus; the combination com prising:'

ing means being operable by a stem extending to an out-of-tank position to open said valve; (2) a cam and shaft means supported adjacent the outer end of the stern of (1) so that oscillation of said cam and shaft alternately move s said stem Ion-- gitudinally so as to open saidvalve and then to allow'said biasing means to close same;

(3) lever means for operating the cam and shaft means of (2) to open the valve of (1); p

(4') a locking shoulder on the cam of- (2) for holding same in position actuating said stemto open said valve;

(5,) a pin supported in alignment with the cam of (2) so as to be reciprocable into and outof locking engagement with the shoulder of (4).;

(6) means biasing the pin of (5) toward the cam of (2), said pin extending longitudinally of said tank;

(7) a bracket suspended from the bottom of said tank provided with pivot means transverse to and in substantial alignment with the pin of (5), said pin extending beyond said bracket;

(8) a pendulum suspended from saidpivot providedwith an upper contacting section at alevel above said pivot and a lower contacting section at a level below said pivot; (9) an upright push plate fixed on the pin'of (5) adjacent the pendulum of (8) so that movement of said pendulum in either direction urges, said plate away frorn'said valve to pull said pin out of locking encomprising:

pin remote from the valve of (I with a handoperating means adjacent an end of said; tank. 4. In a fluid dispensing apparatus, the combination com prising:

' (1) a storage tank having a dispensing valve cornmunicating an out-of-tank passageway With the in terior of said tank, said valve having means biasing same closed, the biasing means being operable by a stern extending to an out-of-tank position to open said valve; 7

(2) a cam and shaft means supportedadjacent the outer end of the stem of (1) so that oscillation of said cam and shaft alternately moves said stem longitudinally so as to open said valve and then to allowsaid biasing means-to close same;

(3) lever means for operating the cam and shaft means of (2); a (4) a locking shoulder on the cam of (2) for hold"- ing' same in position actuating said stemto open said valve; i p (5) a pin supported in alignment with the camiof (2) soas to be reciprocable' into and out of locking engagement with theshoulder of (4);

tion; r (7) a mechanical linkageconnecting the pin' of (5) with a remote operating means comprising:

(a) rod means aligned with said pin and linked thereto at one end; v i (b) means biasing the rod means of (a) away from the cam and shaft of (2) overriding the biasing means of (6); a

('c) locking means restraining the rod' means of (:1) against its biasing means; and (d) a low-temperature, heat-fusible element connected in the locking means of (0) so that fusing of said elementreleases the biasing means of- (b) to unlock the cam of (2) and close the valve of (1). I V V V 5. In a fluid dispensing apparatus, the combination (6) means biasing the pi'nof (5) into locking posi (1) a storage tank having'a dispensing valve communicating an out-of-tank pasageway with the. interior of said tank, 'said valve having means biasing same clo'sed,.the biasing means being operable by a stem extending to an out-of-tank position to open said valve;

(2) a cam and shaft means supported adjacent the outer end of the. stem of (1) so that oscillation of said cam and shaft alternately moves said stem longitudinally so as to open said valve and then allow I said biasing means to close same;

('3') lever meansfor operating the cam' and shaftnmeans (4) a locking shoulder on the cam of (2) for holding same in. position actuating said stem to ,open said valve;

V (5) a pin supported in alignment with the cam of (2) so as to be reciprocable into and out of locking engagementiwith the shoulder of (4); i

(6) means biasing thepin of (5), into locking position;

(7') mechanical linkage connectingthe pin of (5) with a remote operating means;

(8) an upright push plate fixed on the link-age of (7);

- and I a (9) a pendulum suspended adjacent the plate of (8) having a pivot at the level of saidplate. providing an upper section adapted to contact an; upper section of saidplate to pull the pin of (5) oif theshoulder of (4) When said pendulum is moved in one direc tion along said linkage. and a lower section adapted 'to contact a lower section of saidfpl'ate to similarly actuate said pin when said pendulum'is moved in the opposite direction;

6: In a fluid dispensing apparatus, the combination comprising:

(1) a tank car having a dispensing valve communicating an out-of-tank passageway with the interior of said tank, said valve being positioned intermediate ends in the bottom thereof and having means biasing same closed, the biasing means being operable by a stem extending to an out-of-tank position to open said valve;

(2) a cam and shaft means supported adjacent the outer end of the stem of (1) so that oscillation of said cam and shaft alternately moves said stern longitudinally so as to open said valve and then to allow said biasing means to close same;

(3) lever means for operating the cam and shaft means (4) a locking shoulder on the cam of (2) for holding same in position actuating said stem to open said valve;

(5) a pin supported in alignment with the cam of (2) so as to be reciprocable into and out of locking engagement with the shoulder of (4);

(6) means biasing the pin of (5) into locking position;

(7) mechanical linkage connecting the pin of (5) with a remote operating means at one end of said car; and

(8) operating means at the other end of said car connected by mechanical linkage with the pin of (5), including a cable connected with said pin thru a direction reversing means.

References Cited in the file of this patent UNITED STATES PATENTS Reed et al July 5, 1960 

6. IN A FLUID DISPENSING APPARATUS, THE COMBINATION COMPRISING: (1) A TANK CAR HAVING A DISPENSING VALVE COMMUNICATING AN OUT-OF-TANK PASSAGEWAY WITH THE INTERIOR OF SAID TANK, SAID VALVE BEING POSITIONED INTERMEDIATE ENDS IN THE BOTTOM THEREOF AND HAVING MEANS BIASING SAME CLOSED, THE BIASING MEANS BEING OPERABLE BY A STEM EXTENDING TO AN OUT-OF-TANK POSITION TO OPEN SAID VALVE; (2) A CAM AND SHAFT MEANS SUPPORTED ADJACENT THE OUTER END OF THE STEM OF (1) SO THAT OSCILLATION OF SAID CAM AND SHAFT ALTERNATELY MOVES SAID STEM LONGITUDINALLY SO AS TO OPEN SAID VALVE AND THEN TO ALLOW SAID BIASING MEANS TO CLOSE SAME; (3) LEVER MEANS FOR OPERATING THE CAM AND SHAFT MEANS OF (2); (4) A LOCKING SHOULDER ON THE CAM OF (2) FOR HOLDING SAME IN POSITION ACTUATING SAID STEM TO OPEN SAID VALVE; (5) A PIN SUPPORTED IN ALIGNMENT WITH THE CAM OF (2) SO AS TO BE RECIPROCABLE INTO AND OUT OF LOCKING ENGAGEMENT WITH THE SHOULDER OF (4); (6) MEANS BIASING THE PIN OF (5) INTO LOCKING POSITION; (7) MECHANICAL LINKAGE CONNECTING THE PIN OF (5) WITH A REMOTE OPERATING MEANS AT ONE END OF SAID CAR; AND (8) OPERATING MEANS AT THE OTHER END OF SAID CAR CONNECTED TO MECHANICAL LINKAGE WITH THE PIN OF (5), INCLUDING A CABLE CONNECTED WITH SAID PIN THRU A DIRECTION REVERSING MEANS. 